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Radon Levels in Montcalm County, Michigan

EPA puts Montcalm County in Zone 2, its middle radon zone, and 23.6% of its 550 reported radon tests (2008 to 2017, laboratory totals) were at or above 4 pCi/L. Homes with elevated levels occur in all three zones, so only a test measures yours.

Data checked By Radon411Methodology

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  • Share at 4+ pCi/L

    23.6%

    3.3 pts below MI

    Montcalm
    23.6%
    Michigan
    26.9%

    550 tests, 2008 to 2017

  • Median result

    2.1pCi/L

    Below action level

    Montcalm
    2.1 pCi/L
    EPA
    4.0 pCi/L

    Midpoint of the tests, 2008 to 2017

  • Tests reported

    550

    44th of 82 by tests

    Montcalm
    550
    Oakland
    16,224

    Reported to CDC before any fix, 2008 to 2017

  • EPA radon zone

    Zone 2

    Moderate potential

    1. 1
    2. Zone 2
    3. 3

    1 highest, 3 lowest

    EPA predicts 2 to 4 pCi/L indoors

  • Rank in Michigan

    26 of 82

    Middle half

    Montcalm
    23.6%
    Lenawee
    56.7%

    By share, of 82 with 30+ tests

Read a result for Montcalm County

Starts at Montcalm County's median, 2.1 pCi/L

2.1pCi/L

EPA’s own thresholds; the figures are the area’s, never this home’s.

EPA’s reading of 2.1 pCi/L

Between 2 and 4 pCi/L

  1. Under 20 to 1.9 pCi/L
  2. 2 to 4consider a fix
  3. 4 and aboveEPA says fix it

This result is between 2 and 4 pCi/L. EPA recommends considering a fix when the level is between 2 and 4 pCi/L. Montcalm County's median reported result, 2008 to 2017.

Interpret this readingWhat a fix costs

The data

Montcalm County, At a glance

Montcalm County at a glance

Predicted: EPA radon zone

EPA Zone 2: moderate predicted potential

Montcalm County is a county: EPA's forecast for it as a whole is an average indoor of 2 to 4 pCi/L (75 to 150 Bq/m³). It describes no single address, and homes above EPA's are found in every zone, this one included.

USGS geologic potential: Moderate across 97% of the county's area

Predicted: EPA Map of Radon Zones

Measured: tests reported to CDC

Radon tests reported for Montcalm County, 2008 to 2017, laboratory

Reported results by concentration band, Montcalm County, 2008 to 2017, laboratory
Under 2 pCi/L: 47%2 to 4 pCi/L: 29%4 pCi/L and above: 24%

Of 550 pre-mitigation tests reported to CDC, not homes in this area.

Reported results by concentration band, Montcalm County, 2008 to 2017, laboratory: data table
Result bandTests MeasuredShare Measured
Under 2 pCi/L26047.3%
2 to 4 pCi/L16029.1%
4 pCi/L and above13023.6%
What these figures count

These are the 550 tests reported to CDC for Montcalm County over 2008 to 2017 (laboratory totals), many from homes being sold or already suspected of a problem: they describe the county's reported tests, not this house.

Measured: CDC tracking data. Figure above: 2008 to 2017, laboratory. Measured data period: 2005 to 2017 (every CDC figure on file).

How to read these figures

Montcalm County, Compared

Montcalm County radon figures, compared

Calculated by Radon411

Montcalm County's 550 reported tests over the 2008 to 2017 laboratory totals had a middle value of 2.1 pCi/L and a maximum of 15.6 pCi/L, and 23.6% reached 4 pCi/L. Michigan as a whole (83 Michigan counties, pooled) comes to 26.9%: 3.3 points higher than here.

Among its state's counties it ranks 26th of 82 Michigan counties with 30 or more tests for the same period. Statewide for the same period, Lenawee County reported the highest share (56.7%) and Muskegon County the lowest (3.2%).

Below the action level, 260 tests (47.3%) came in under 2 pCi/L, against 46.4% statewide, and 160 tests (29.1%) fell between 2 and 4, against 26.7% statewide. CDC's ten-year totals for Montcalm County went from 628 tests (2005 to 2014) to 550 (2008 to 2017), the share going from 22.9% to 23.6%.

EPA's 1993 zone map puts Montcalm County in Zone 2, a predicted county average between 2 and 4 pCi/L. USGS geology rates 97% of the county's land moderate radon potential.

Next door, the shares run from 7.9% in Newaygo County to 38.5% in Clinton County, with Mecosta County, Gratiot County and Kent County below Montcalm County.

CDC also counts 18 tests taken after mitigation in Montcalm County for the same period: tests in homes where a fix was already in.

Montcalm County against Michigan, the United States and nearby counties, 2008 to 2017, laboratory
AreaTestsAt or above 4 pCi/LMedianDifference from Montcalm County
Montcalm County55023.6%2.1 pCi/LThis county
Michigan, pooled83 counties, pooled114,40726.9%Not pooled+3.3 points
United States, pooled2,661 counties, pooled2,013,54435.7%Not pooled+12.1 points
Lenawee Countyhighest in the state1,90756.7%4.6 pCi/L+33.1 points
Muskegon Countylowest in the state6293.2%1.2 pCi/L−20.4 points
Clinton County, MIborders it2,31338.5%3.1 pCi/L+14.9 points
Ionia County, MIborders it1,39136.8%2.9 pCi/L+13.2 points
Mecosta County, MIborders it61421.7%2.0 pCi/L−1.9 points
Gratiot County, MIborders it45716.8%1.7 pCi/L−6.8 points
Kent County, MIborders it8,44916.5%1.8 pCi/L−7.1 points
Isabella County, MIborders it87016.4%1.6 pCi/L−7.2 points
Newaygo County, MIborders it4677.9%1.3 pCi/L−15.7 points
Where Montcalm County's reported results fell, 2008 to 2017, laboratory, beside Michigan and the United States
ResultMontcalm County testsMontcalm County shareMichigan shareU.S. shareAgainst Michigan
Under 2 pCi/L26047.3%46.4%39.6%+0.9 points
2 to 4 pCi/L16029.1%26.7%24.7%+2.4 points
4 pCi/L and above13023.6%26.9%35.7%−3.3 points
Montcalm County ranked among the 82 Michigan counties with 30 or more tests, by share at or above 4 pCi/L, 2008 to 2017, laboratory
CountyRankTestsAt or above 4 pCi/LMedian
Monroe County21 of 821,37530.4%2.5 pCi/L
Oakland County22 of 8216,22428.8%2.3 pCi/L
Huron County23 of 8226026.5%1.9 pCi/L
Ingham County24 of 822,93224.9%2.2 pCi/L
Berrien County25 of 821,19224.2%2.0 pCi/L
Montcalm County26 of 8255023.6%2.1 pCi/L
Marquette County27 of 821,08223.4%2.0 pCi/L
Presque Isle County28 of 8250922.8%1.9 pCi/L
Keweenaw County29 of 824422.7%0.9 pCi/L
Genesee County30 of 821,69921.9%2.0 pCi/L
Mecosta County31 of 8261421.7%2.0 pCi/L
Montcalm County ten-year laboratory totals, against Michigan's pooled share
PeriodTestsAt or above 4 pCi/LMedianHighestMichigan, pooledChange from the row before
2008 to 201755023.6%2.1 pCi/L15.6 pCi/L26.9%+0.4 points
2007 to 201658723.2%2.1 pCi/L15.6 pCi/L26.8%+0.5 points
2006 to 201561722.7%2.0 pCi/L15.6 pCi/L26.8%−0.2 points
2005 to 201462822.9%2.0 pCi/L15.6 pCi/L26.2%First on file

Pooled shares: Radon411's sum of CDC's county counts for one period.

Montcalm County, State data

Michigan's own radon test data

Measured

What Michigan's own agencies publish about radon tests in Montcalm County, with their period. These are not CDC's figures and are never added to them.

MeasuredState figures, not CDC's

What Michigan EGLE reports for the ZIP codes in Montcalm County

Michigan EGLE publishes its figures by ZIP code, not by county. These are the 24 ZIP codes that lie wholly or partly in Montcalm County, each with the state's own figures for it. Period: About 10 years to 2026-05-15.

ZIP codes in Montcalm County
ZIP codeWhat the state reports
4880927% greater than 4 pCi/L, median 2.6 pCi/L, 62 tests
488113 tests, figures not shown
4881814% greater than 4 pCi/L, median 0.8 pCi/L, 14 tests
488298% greater than 4 pCi/L, median 1.8 pCi/L, 12 tests
4883430% greater than 4 pCi/L, median 2.9 pCi/L, 10 tests
4883833% greater than 4 pCi/L, median 2.4 pCi/L, 92 tests
488450% greater than 4 pCi/L, median 0.0 pCi/L, 5 tests
488507% greater than 4 pCi/L, median 0.8 pCi/L, 15 tests
488770% greater than 4 pCi/L, median 0.0 pCi/L, 5 tests
4888421% greater than 4 pCi/L, median 1.8 pCi/L, 24 tests
488853 tests, figures not shown
488863 tests, figures not shown
4888842% greater than 4 pCi/L, median 3.1 pCi/L, 19 tests
488891 tests, figures not shown
4889110% greater than 4 pCi/L, median 1.5 pCi/L, 10 tests
493100% greater than 4 pCi/L, median 0.9 pCi/L, 6 tests
493222 tests, figures not shown
493268% greater than 4 pCi/L, median 1.3 pCi/L, 13 tests
4932913% greater than 4 pCi/L, median 1.3 pCi/L, 16 tests
4933622% greater than 4 pCi/L, median 1.9 pCi/L, 9 tests
4933722% greater than 4 pCi/L, median 1.7 pCi/L, 37 tests
493390% greater than 4 pCi/L, median 1.1 pCi/L, 6 tests
493438% greater than 4 pCi/L, median 1.6 pCi/L, 26 tests
493474 tests, figures not shown
  • EGLE's figures cover first-time tests only, from organizations willing to provide data.
  • EGLE does not publish figures for a ZIP code with fewer than 5 test results.
  • EGLE says the map is not intended to decide whether a home should be tested: all homes should be tested.
  • ZIP code boundaries are postal delivery areas, not legal or administrative boundaries.
  • A ZIP code that crosses the county line is listed whole; its figures cover all of it.

Measured: Michigan EGLE data, About 10 years to 2026-05-15.

Montcalm County, Geology

The ground under Montcalm County

Predicted

Most of the ground under Montcalm County is one class on USGS's geologic map: 97.4% of its land is moderate radon potential, with 2.6% low. 97.4% of it lies in the area the map calls South-Central Michigan Basin, to which USGS gives a radon index of 10, in the moderate band (9 to 11).

USGS's geologic areas under Montcalm County
AreaThe rock, in USGS's wordsPotentialRadon indexShare of land
South-Central Michigan BasinSandy and silty glacial deposits derived from sandstones, gray shales, limestones, and dolomites.Moderate1097.4%
North-Central Michigan BasinSandy and silty glacial deposits derived from sandstones, gray shales, limestones, and dolomites.Low82.6%

Names, descriptions and indexes: U.S. Geological Survey, Geologic Radon Potential Map (2025). Shares: Radon411, from the map cut to the boundary.

Montcalm County beside the ground around it

Across Michigan 9.6% of the land is rated high; none of Montcalm County's is. Of the 7 counties that border it, 1 has more moderate-potential ground, Ionia County the most at 100%.

Share of land by USGS radon potential: Montcalm County, the 7 counties bordering it and Michigan
AreaEPA zoneLow potentialModerate potentialHigh potential
Montcalm CountyZone 22.6%97.4%None
Ionia CountyZone 2None100%None
Gratiot CountyZone 357.9%42.1%None
Isabella CountyZone 373.5%26.5%None
Mecosta CountyZone 379.3%20.7%None
Kent CountyZone 223.6%76.4%None
Clinton CountyZone 26.0%94.0%None
Newaygo CountyZone 390.2%9.8%None
Michigan83 counties, pooled by land areaVaries45.0%44.3%9.6%

The map rates the ground, not the air in any home.

Local help

Montcalm County, Local resources

Radon testing and mitigation in Montcalm County

What Michigan's program says
Phone
800-723-6642
Email
Radon@Michigan.gov
Licensing of radon professionals
Michigan does not license or regulate radon testing and mitigation contractors.

What it means

Montcalm County, Questions

Questions about radon in Montcalm County

Are radon levels high in Montcalm County?

Over the 2008 to 2017 laboratory totals, 23.6% of the radon tests reported to CDC for Montcalm County, Michigan were at or above 4 pCi/L, and the median reported pre-mitigation result was 2.1 pCi/L. Of 82 Michigan counties with 30 or more tests for the same period, 25 reported a higher share; pooled, the state comes to 26.9%.

Which counties border Montcalm County?

Montcalm County borders 7 counties: Ionia County, Gratiot County, Isabella County, Mecosta County, Kent County, Clinton County and Newaygo County.

Products

Montcalm County, Products

Testing a home in Montcalm County

In Montcalm County, 23.6% of 550 tests reported to CDC over the 2008 to 2017 laboratory totals reached 4 pCi/L, against 26.9% pooled across Michigan. In Zone 2 a short-term kit (2 to 90 days) is the quick first check in Montcalm County; a long-term test tells the year-round average.

Test kits and monitors3

See every kit and monitor

Best radon monitors for Montcalm County homes, compared

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Montcalm County, Bordering counties

Counties bordering Montcalm County

Calculated by Radon411

Montcalm County, Cities and towns

Cities and towns in Montcalm County

The Census Bureau estimates 69,406 residents in Montcalm County for July 1, 2025, 2,747 more than in 2020 (+4.1%). That works out to 98 people per square mile of land. No town dominates: Greenville, the largest, has 9,256 residents, 13.3% of the total. Together its 9 incorporated places hold 24.7% of those residents; the other 75.3% live outside any of them. CDC's 550 reported tests for 2008 to 2017 work out to 7.9 per 1,000 residents (2025 estimate), close to Michigan's 11.3.

From Greenville to Pierson, CDC publishes no figure by town: each reads Montcalm County's.

The cities and towns in Montcalm County by residents, July 1, 2025
PlaceResidentsSince 2020Share of residents
Greenville9,256+5.0%13.3%
Howard City1,923+4.9%2.8%
Stanton1,383+3.2%2.0%
Edmore1,274+4.0%1.8%
Carson City1,137+2.8%1.6%
Lakeview1,048+2.9%1.5%
Sheridan717+3.2%1.0%
McBride225+3.2%0.3%
Pierson205+2.5%0.3%

9 incorporated places, as listed in the U.S. Census Bureau’s 2020 place reference files. Residents: U.S. Census Bureau population estimates for July 1, 2025 (Vintage 2025).

Montcalm County, Homes

Homes in Montcalm County

Montcalm County is a place of houses on their own lots: 77% of its 28,046 homes are detached single-family houses, against 72% across Michigan. Half of its homes were built before 1977, close to Michigan's 1972: 30% date from before 1960 and 19% from 2000 or later. Owners live in 82% of the occupied homes (Michigan: 73%), so for most households a test and a fix are their own to order.

Homes in Montcalm County, Michigan, 2019 to 2023
HomesMontcalm CountyMichigan
Housing units28,0464,599,683
Detached houses77%72%
In buildings of 5 or more5%13%
Mobile homes14%5%
Built before 196030%36%
Built since 200019%15%
Middle year built19771972
Owner-occupied82%73%

Census Bureau, American Community Survey, 2019 to 2023: estimates from a sample of homes, looser for a small place. Shares by Radon411.